From 794d19cbaa7b40a3ee378a447a646a2d70e8ac7a Mon Sep 17 00:00:00 2001
From: Marek Moeckel <wansti@gmx.de>
Date: Sun, 15 May 2005 10:06:37 +0000
Subject: [PATCH] more work on rain

SVN-Revision: 2488
---
 src/object/particlesystem_absolute.cpp | 31 +++++++++----------------------
 src/object/particlesystem_absolute.h   | 12 ++++--------
 2 files changed, 13 insertions(+), 30 deletions(-)

diff --git a/src/object/particlesystem_absolute.cpp b/src/object/particlesystem_absolute.cpp
index 95e1ae539..e3713cb72 100644
--- a/src/object/particlesystem_absolute.cpp
+++ b/src/object/particlesystem_absolute.cpp
@@ -36,15 +36,14 @@
 #include "collision_hit.h"
 #include "object/camera.h"
 
-//TODO: Try to equally distribute rain throughout the level
-//      Dynamically create splashes at collision spots
-//      Check why it can rain through boxes
+//TODO: Dynamically create splashes at collision spots
+//      Find a way to make rain collide with objects like bonus blocks
 //      Add an option to set rain strength
 ParticleSystem_Absolute::ParticleSystem_Absolute()
 {
     virtual_width = SCREEN_WIDTH;
     virtual_height = SCREEN_HEIGHT;
-    layer = LAYER_BACKGROUND1;
+    layer = LAYER_TILES;
 }
 
 ParticleSystem_Absolute::~ParticleSystem_Absolute()
@@ -57,25 +56,11 @@ ParticleSystem_Absolute::~ParticleSystem_Absolute()
 
 void ParticleSystem_Absolute::draw(DrawingContext& context)
 {
-  //float scrollx = context.get_translation().x;
-  //float scrolly = context.get_translation().y;
-
   context.push_transform();
-  //context.set_translation(Vector(0,0));
   
     std::vector<Particle*>::iterator i;
     for(i = particles.begin(); i != particles.end(); ++i) {
         Particle* particle = *i;
-
-        // remap x,y coordinates onto screencoordinates
-        /*Vector pos;
-        pos.x = fmodf(particle->pos.x - scrollx, virtual_width);
-        if(pos.x < 0) pos.x += virtual_width;
-        pos.y = fmodf(particle->pos.y - scrolly, virtual_height);
-        if(pos.y < 0) pos.y += virtual_height;
-
-        if(pos.x > SCREEN_WIDTH) pos.x -= virtual_width;
-        if(pos.y > SCREEN_HEIGHT) pos.y -= virtual_height;*/
         context.draw_surface(particle->texture, particle->pos, layer);
     }
 
@@ -90,7 +75,7 @@ RainParticleSystem::RainParticleSystem()
     virtual_width = SCREEN_WIDTH * 2;
 
     // create some random raindrops
-    size_t raindropcount = size_t(virtual_width/4.0);
+    size_t raindropcount = size_t(virtual_width/6.0);
     for(size_t i=0; i<raindropcount; ++i) {
         RainParticle* particle = new RainParticle;
         particle->pos.x = rand() % int(virtual_width);
@@ -138,8 +123,11 @@ void RainParticleSystem::update(float elapsed_time)
         particle->pos.y += movement;
         particle->pos.x -= movement;
         if ((particle->pos.y > SCREEN_HEIGHT + abs_y) || (collision(particle, Vector(-movement, movement)))) {
-            particle->pos.y = 0;
-            particle->pos.x = rand() % int(abs_x + virtual_width);
+            int new_x = (rand() % int(virtual_width)) + int(abs_x);
+            int new_y = 0;
+            //FIXME: Don't move particles over solid tiles
+            particle->pos.x = new_x;
+            particle->pos.y = new_y;
         }
     }
 }
@@ -169,7 +157,6 @@ RainParticleSystem::collision(RainParticle* object, Vector movement)
   for(int x = starttilex; x*32 < max_x; ++x) {
     for(int y = starttiley; y*32 < max_y; ++y) {
       const Tile* tile = solids->get_tile(x, y);
-      //std::cout << "Tile at: " << x << "," << y << std::endl;
       if(!tile)
         continue;
       // skip non-solid tiles
diff --git a/src/object/particlesystem_absolute.h b/src/object/particlesystem_absolute.h
index 1a3d13755..0db25986a 100644
--- a/src/object/particlesystem_absolute.h
+++ b/src/object/particlesystem_absolute.h
@@ -34,16 +34,12 @@ class Lisp;
 class DisplayManager;
 
 /**
- * This is the base class for particle systems. It is responsible for storing a
+ * This is an alternative class for particle systems. It is responsible for storing a
  * set of particles with each having an x- and y-coordinate the number of the
  * layer where it should be drawn and a texture.
- * The coordinate system used here is a virtual one. It would be a bad idea to
- * populate whole levels with particles. So we're using a virtual rectangle
- * here that is tiled onto the level when drawing. This rect.has the size
- * (virtual_width, virtual_height). We're using modulo on the particle
- * coordinates, so when a particle leaves left, it'll reenter at the right
- * side.
- *
+ * This version of the particle system class doesn't use virtual screen coordinates,
+ * but absolute ones. Particle systems which need absolute levels coordinates, such
+ * as rain, should be implemented here.
  * Classes that implement a particle system should subclass from this class,
  * initialize particles in the constructor and move them in the simulate
  * function.
-- 
2.11.0